Thomson-Csf

Thomson Consumer Electronics Inc.

Thomson Video Equipment

Luc P Van Cang

Device for detecting termination of connection to a programme to be paid

Device for obtaining continuous plots on the screen of a display console controlled by a graphic processor, comprising a graphic memory for storing in binary form the matrix of points or pixels representing the image displayed on the screen and an attribute memory containing the attributes of each of the points of the image. An interpolation circuit contains a table for calculating the attributes of the intermediate points between consecutive points of the dot matrix. The table of the interpolation circuit is addressed by the preexisting value PA of the pixel to be modified found in the attribute memory, by the value PN of the attribute of the pixels on the plot on either side of the point to be modified and by an interpolation value F equal to the fractional part of the position of the point to be modified between consecutive points on the plot, each position in the table containing an attribute value PM confirming the relationship

Device for obtaining continuous plots on the screen of a display console

A variable-passband, variable-phase digital filter in which Q digital samples of a signal are entered through (Q-1) delay lines, to be delayed into q two-bit adjacent doublets. Weighting tables in read only memories are addressed by each doublet. Each weighting table includes the results of linear combinations of the weights of doublets composed of bits of the same order multiplied by multiplier coefficients which are smaller than unity. Each integral portion of a result found in a table is applied at the same time as the fractional portions of the other results provided by the other tables to the addressing inputs of a programmed memory containing binary words. Binary words are addressed in the prorammed memory by the integral and fractional portions of the results found in the weighting tables. Each binary word has a value equal to the linear combination of the corresponding values of the samples of the signal by the multiplier coefficients.

Variable-passband variable-phase digital filter

The device comprises a generator of the current address of the signal appearing at the input of the device, a unit for sampling the signal received by the device and a comparator connected by an input to the output of the current address generator, another input of the comparator receiving the address of the signal which is to be acquired and the output of the comparator supplying a control signal for the sampling unit in order to authorize it to acquire the current signal present at the input of the device, when the address of the current signal is equal to the address of the signal which is to be acquired.

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Savigny Sur Orge, France

Luc P Van Cang